Repairing Guides

how to repair rotted deck post

by Guillermo Ebert V Published 2 years ago Updated 1 year ago
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  • Place the old post on a workspace and remove the rotted part. ...
  • Regardless of which part of the old post you are repairing, you’ll need to laminate the new part with the old post. How to do that? ...
  • Use marine epoxy to fit the old and new pieces together. You’ll need to let it sit overnight. ...
  • Clamp the new and old pieces together, and use a mallet and scrap wood to ensure the new piece is snug and flush to the old deck post.
  • Once dry, sand and finish to ensure the new part and old part mesh nicely.
  • Re-install the post. It is recommended that you put a plastic or PVC shim between the repaired post and the bottom surface. ...

How do you repair a rotting deck post?

How do you repair a rotting deck post?

  • Draw a line around the column about 2 inches above the rotted area and install a temporary brace under the deck, porch, or roof.
  • Using a chisel and hammer or a Saws-All, chip out the damaged wood below that mark.
  • Use a brush or spray bottle to coat preservative on the exposed bare wood.

How do you replace a deck post?

Things You Will Need

  • Floor/pole jack (at least one)
  • Drill
  • Ratchet set
  • New four-by-four or six-by-six post
  • Post box bracket
  • Four anchor bolts
  • Concrete drill bit
  • Lag bolts and nuts
  • Concrete form
  • J-bolt

More items...

How to stop deck post leaks?

What to Put Under a Second Story Deck to Keep It From Dripping Onto a Patio Below

  • General Information. A second story deck that is made of wood flooring includes gaps between planks and around the perimeter of the deck.
  • Aluminum. Aluminum provides a structurally-strong under deck system. ...
  • Vinyl. A vinyl under deck system provides an affordable option. ...
  • Steel. Steel panels are another option for your under deck system. ...
  • Alternatives. ...

How to replace a deck post?

  • $750 for the wood
  • $30 in supplies, including nails and screws, etc.
  • $500 for a contractor to replace the wood

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How do you fix rotting wood post without replacing it?

3:437:27How to Repair a Rotted Porch Post | Ask This Old House - YouTubeYouTubeStart of suggested clipEnd of suggested clipBut i still don't have a lot of lateral. Strength. So what i like to do is put a scarf or a half lapMoreBut i still don't have a lot of lateral. Strength. So what i like to do is put a scarf or a half lap joint when i put the two pieces.

How do you repair a rotten deck post?

The best way to repair rotted deck post is to replace it. If the post has been sunk into the ground and backfilled, you'll need to excavate the entire post, remove it, and install concrete in a sonotube to above grade. You can then mount a new deck post and post bracket on top of the new concrete support.

How do you fix rotted pressure treated wood?

5 Steps to Repair Wood RotGather tools and materials.Remove rotten boards Use a 5-in-1 rasp, chisel, or claw hammer to remove the rotted areas of wood. ... Apply wood hardener, filler, or epoxy If minor damaged wood cannot be easily replaced, wood hardener, filler or epoxy may help strengthen the damaged area.More items...•

How do you replace a load bearing deck post?

0:285:44How to replace a load bearing post - YouTubeYouTubeStart of suggested clipEnd of suggested clipAs a first effort. To allow us to take it out and we need to support that while we're repo'ingMoreAs a first effort. To allow us to take it out and we need to support that while we're repo'ing concrete. This post is supporting the upper floor deck but it's not supporting a whole lot of weight.

How much does it cost to replace deck posts?

Replacing deck posts costs $200 to $400 per post. The exact price depends on the post material, installation method, and number of replacements. For example, a simple pressure-treated wooden post does not cost as much to replace as a more elaborate and thicker cedar post.

How long do deck posts last?

Estimated to be 25 to 30 years.

Why is my pressure treated deck rotting?

Any pressure treated wood rot is usually due to a fungal issue. The fungi that cause this are very small organisms that move into the wood and feed on it over time. This causes the pressure treated wood to decay and soften which then turns into rot. All kinds of fungal issues basically create the same problem: rot.

Will vinegar stop wood rot?

White vinegar will stop wood rot because it is a fungicide, which has antimicrobial properties. As wood rot is caused by fungi that require an acidic environment ranging from 0-5.5 (pH), white vinegar solves the problem by changing the pH level in the wood.

Can wood filler be used on a deck outside?

You can use it inside and outside without worrying about it flaking away, and it works very well when used to repair small gouges, cracks, knot holes, nail holes, and defects in unfinished outdoor and indoor wooden surfaces.

How do you reinforce a deck post?

Reinforce post connections Strengthen post connections with carriage bolts. Drill holes, knock the bolts through, then tighten a washer and nut on the other side. Ideally, posts should sit directly under the beam or rim joist to support the deck.

How can you tell if a post is structural?

Check Out the Building Plans If a wall or column is structural, it will usually be marked with an "S". It is important to note that a decorative post or column may not be included in plans as it doesn't carry any weight and may have been added as an afterthought.

How do you replace a 4x4 porch post?

0:0212:55Replace Porch Columns (Porch Posts / Porch Columns / Use ... - YouTubeYouTubeStart of suggested clipEnd of suggested clipSo it lets you go from the floor of your porch up to the beam. That is resting on the column. AndMoreSo it lets you go from the floor of your porch up to the beam. That is resting on the column. And produce a little upward pressure to get that load off of the column.

How do you reinforce a deck post?

Reinforce post connections Strengthen post connections with carriage bolts. Drill holes, knock the bolts through, then tighten a washer and nut on the other side. Ideally, posts should sit directly under the beam or rim joist to support the deck.

How do you harden wood rot?

Minwax® High Performance Wood Hardener is a quick drying liquid formulated to strengthen and reinforce decayed or rotting wood.

How do you repair a rotted support beam?

3:139:38How to Repair a Damaged Carrying Beam | Ask This Old HouseYouTubeStart of suggested clipEnd of suggested clipI'll support the beam with a bottle jack and a temporary. Post then i'll cut the old post out with aMoreI'll support the beam with a bottle jack and a temporary. Post then i'll cut the old post out with a. Grinder all right and that's our length.

What to use to keep 4x4 posts from moving?

Use a lateral brace to keep the 4x4 posts from moving.

How do I clean a footer on a boat?

I spent a good amount of time cleaning the footer. Using a small shop vac and scraping tool, I removed all the dirt I could on top of and in the hole in the footer. Then I used a garden hose with the nozzle set to fine spray to get the rest of the dirt off. The shop vac was used to clean the remaining muddy water from the footer.

Why not pour new concrete on top of old concrete?

On a very windy day, under the right conditions, the wind can blow under the deck or roof structure and lift the deck up if it is not anchored properly. If rebar is not used to anchor the old footer to the new concrete, the deck could lift up and crash down.

How to hold old concrete footer to new concrete?

To hold the old concrete footer to the new concrete that would be poured, I had to put a rebar structure in place. The structure consisted of 4 vertical rebar rods placed into 3" deep holes drilled into the existing footer. The rebar rods would extend up to 2" from the top of the new concrete footer. A rebar square would be wired near the top of the rebar rods.

How to hold rebar in footer?

To hold the rebar in the old footer, I used a concrete anchoring adhesive called Sika Super Strength Anchoring Adhesive from Lowes. It was actually an expensive epoxy that came in a tube that fit in my standard calking gun and every home improvement store carries an equivalent brand. For best results, I squeezed the adhesive into ONE 3" hole to about 3/4 full. Then I pressed the rebar rod into the hole, twisting back and forth slightly as it went down. As it did go down, the level of the adhesive went up to leave a nice ring around the top of the hole. Then I moved on to the next hole. The epoxy adhesive hardens FAST. It is very important to work on ONE hole at a time.

What screws are used to mount a J bolt post base?

Now I could put the post base assembly on the post base. It was mounted in place by 2 1/2" #9 (10d) Simpson Strong Tie galvanized structural screws.

What holds a J bolt in place?

The J portion is pushed into the wet concrete. When dried, the concrete holds the bolt firmly in place, especially around the J. In the event of an updraft, the post bracket would try to pull the J bolt out of the concrete, but it would stay in place.

How to repair or replace rotting deck posts?

A lot of people say that the posts can not contact the concrete, unfortunately it appears to be the case for my deck. We just purchased the house a few weeks ago and found the bottom of the post a bit rot. As you can see in the pictures the bottom part of the posts are buried in concrete.

Comments (7)

Can you show some pictures of the entire deck and railing construction so we can see what it's holding up and how strong it needs to be and how hard it might be to replace.

Why is composite decking not rot?

Simply because composite decking does not rot. Composite decking is made from moisture- and insect-resistant materials that are stronger and more durable than wood, and require minimal upkeep. For example, a deck constructed with composite material never needs to be painted or stained.

How to tell if a deck is dry rot?

How to Identify Dry Rot on a Deck. Some older decks will begin to show signs of dry rot. The symptoms include spongy and discolored wood that may flake off and fall apart when wet. You can use a screwdriver to test the wood for soft spots. You can also tell if deck wood is rotten by checking for these dry rot signs:

What is Dry Rot?

You can use a screwdriver to test the wood for soft spots. In certain conditions, even pressure-treated wood can rot and decay. Moisture and pooling water on decks can lead to rot and decay. Because dry rot is a fungus, it can spread like a cancer throughout a deck. Dry rot is caused by microorganisms that eat the cellulose from the wood leaving it brittle. Dry rot will also attract wood-eating insects such as termites, which will compound the problem.

What causes dry rot in a house?

Inspect the surrounding area of dry rot for a source or cause – plumbing leaks, gutter failure, sprinkler system issue, and any and all other water pooling possibilities.

How to tell if wood is rotting or decaying?

You can use a screwdriver to test the wood for soft spots. In certain conditions, even pressure-treated wood can rot and decay. Moisture and pooling water on decks can lead to rot and decay.

What wood is rot resistant?

Rot-Resistant Woods And Composite Decking. Another way to prevent your deck from rotting is to build it with redwood, mahogany, cypress or cedar, each of which are among the most rot-resistant species of natural wood. Nonetheless, a wood deck, by its very nature, will always be susceptible to moisture and rot.

Why do you need to clean your deck?

An annual cleaning will keep your deck looking aesthetically appealing on the surface, but more importantly, cleaning can help forestall repairs, such as rotten decking, by ridding early signs of dirt, mildew and bacteria buildup.

Why Do Deck Joists Rot?

The simple answer is any wood that regularly gets wet and can’t dry out will rot. Wood joists stay wet when a deck drainage system is installed below the joists.

What to use to fix rotten wood?

For small repairs, you may be able to use wood putty and a reinforcing joist. With this method, you’ll chisel out the rotten wood and reinforce what’s left and securely attach new wood.

How does under deck drainage work?

Under-deck drainage systems that are mounted below the joists cause damage in three ways: First, they allow the wood to get wet over and over again as rain drips through the deck boards, over the joists and into the drainage system below. The water hits the pan and runs out, but not before drenching the joists.

What is the formula for wood rot?

Over time, this is the perfect formula for wood rot: moisture + heat – ventilation = destruction.

Can you paint exposed wood joists?

Some homeowners will paint the exposed joists (on three sides), which can cause further damage. As the wood on the top gets wet, there’s no way for the painted wood to release the moisture.

Can you use wood putty on rotten wood?

For small repairs , you may be able to use wood putty and a reinforcing joist. With this method, you’ll chisel out the rotten wood and reinforce what’s left and securely attach new wood. However, if joists need to be replaced, you’ll have a bigger commitment of time and skill.

Does a drainage system dry out wood?

Second, this type of system traps in the moisture, because with a drainage system and ceiling below the joists and decking above and on the sides, there’s no air coming in to dry out the wood. The only ventilation is through the quarter-inch or less spaces between the top boards.

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